On considère , l'expression 9 (x + 1) + x (x + 1).
2. Recopier et compléter :
9(x+1) + x (x + 1) = (... + ... ) (... + ...) .
2. Recopier et compléter :
9(x+1) + x (x + 1) = (... + ... ) (... + ...) .
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9(x + 1) + x (x + 1)(9x + 9) + (x² + 1)
9x³+ 9x + 9x² + 9
9x³ + 9x² + 9x + 9